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Segment Information - Selected Financial Details Regarding the Company's Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 14,283 | $ 16,236 | $ 43,561 | $ 42,743
Gross profit | 495 | 2,759 | 4,958 | 7,613
Income (loss) from consolidated continuing operations | (2,187) | 971 | (1,538) | 2,104
Net equity income from foreign joint ventures' operations | 228 | 368 | 1,522 | 2,936
Foreign joint ventures’ operations related expenses | (122) | (66) | (412) | (204)
Income (loss) from consolidated continuing operations and net equity income from foreign joint ventures’ operations | (1,959) | 1,339 | (16) | 5,040
Gross profit, percentage | 3.00% | 17.00% | 11.00% | 18.00%
Income (loss) from consolidated continuing operations, percentage | (15.00%) | 6.00% | (4.00%) | 5.00%
Technical Products and Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 12,618 | 13,970 | 38,743 | 35,607
Gross profit | 251 | 2,428 | 4,385 | 6,117
Income (loss) from consolidated continuing operations | (210) | 2,188 | 3,623 | 5,372
Gross profit, percentage | 2.00% | 17.00% | 11.00% | 17.00%
Income (loss) from consolidated continuing operations, percentage | (2.00%) | 16.00% | 9.00% | 15.00%
Electrical and Instrumentation Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 1,665 | 2,266 | 4,818 | 7,136
Gross profit | 244 | 331 | 573 | 1,496
Income (loss) from consolidated continuing operations | 62 | 331 | 391 | 1,496
Gross profit, percentage | 15.00% | 15.00% | 12.00% | 21.00%
Income (loss) from consolidated continuing operations, percentage | 4.00% | 15.00% | 8.00% | 21.00%
Corporate and other unallocated expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (loss) from consolidated continuing operations | (2,039) | (1,548) | (5,552) | (4,764)
Income (loss) from consolidated continuing operations, percentage | (14.00%) | (9.50%) | (13.00%) | (11.00%)
BOMAY |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net equity income from foreign joint ventures' operations | 285 | 475 | 1,793 | 2,123
MIEFE |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net equity income from foreign joint ventures' operations | 65 | (12) | 139 | 146
AAG |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net equity income from foreign joint ventures' operations |  | (29) | 2 | 871
Foreign Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Foreign joint ventures’ operations related expenses | $ (122) | $ (66) | $ (412) | $ (204)

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